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Torsion in Shaft Calculator
Calculate torque, shear stress, and angle of twist in circular shafts under torsion. Step-by-step formulas included for solid and hollow shafts.
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Shaft Design Calculator
Design shafts by calculating torque, bending stress, torsional stress, combined stress, and factor of safety. Step-by-step formulas included for rotating shafts.
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Key and Keyway Design Calculator
Calculate key dimensions, shear stress, compressive stress, and torque capacity. Step-by-step formulas included for square, rectangular, and Woodruff keys.
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Coupling Design Calculator
Calculate coupling dimensions, transmitted torque, misalignment capacity, and stress. Step-by-step formulas included for rigid and flexible couplings.
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Torque Calculator
Calculate torque easily using force and lever arm distance. Our Torque Calculator helps engineers and mechanics determine rotational force in seconds.
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Mechanical Torque Calculator
Calculate torque, force, or lever arm using T = F × r. Supports unit conversions for N·m, kg·m, and various force and distance units.
Torque Calculators: Free Bolt, Motor & Load Design Tools
Solve torque-related mechanical design problems with our free online torque calculators. Whether you are calculating bolt tightening torque for a flange assembly, determining motor shaft torque for a conveyor drive, or finding the torque required to lift a load with a lever arm, these tools deliver precise results instantly. Enter your force, lever arm length, rotational speed, or power rating to receive torque magnitude, unit conversions between Nm, lb-ft, and kg-cm, and safety factor recommendations. Each calculator includes thread friction coefficients, bolt grade specifications, power-to-torque conversions, and dynamic load factors for real-world engineering application. Mechanical engineers, maintenance technicians, and automotive specialists use these tools to prevent fastener failure, size motors correctly, and ensure safe mechanical power transmission. From hand-tightened screws to industrial drive shafts, our torque calculators cover every rotational force need. No signup required—access from any device and design with confidence.